"When are you going to stop doing games and start doing something more grown-up?" Ex-Rockstar co-founder Dan Houser has said that during the years between Grand Theft Auto Vice City and GTA IV, he was asked to do something "more grown-up", until the types of people who wanted to work in the industry changed. What's been your favourite GTA game to date? #GTA #GrandTheftAuto #BBCNews